Jan-02

PHENIX CentralPHENIX Central

Jan-02

High pHigh pTT at RHIC at RHIC Measured in PHENIX for

Charged hadrons 0’s (with both PgGl and PbSc

calorimeters) Observe

Peripheral collisions: Good agreement with scaled p-p reference

Central collisions: Clear deficit with respect to scaled reference

Jan-02

Is It New?Is It New?

Historically, enhancements have been seen in per-nucleon yields of high pT hadrons from proton-nucleus and nucleus-nucleus collisions: “Cronin effect”

This is the first observation of a suppression

Jan-02

Jan-02